Eric's new job really interests him. he finds himself completely immersed in his work and so focused that the tasks seem effortless. what term describes this state of rapt attention?

The state of rapt attention that Eric is in is called to be the flow. This is the term being used when the person just goes with the flow or which he moves in a continuous and steady way. It is seen from the scenario above as he works on the task without doing any effort as it implies that he just goes with the task in a steady and continuous manner, this happens because of the reason that he is immersed and focused at his work.